Rotary shutter for rontgen apparatus



Dec. 6, 1932. w. BAUERMElsTr-:R 1,890,350

ROTARY SHUTTER FOR RNTGEN APPARATUS Filed Deo. 11. 1928 2 Sheets-Sheet 1 Dec. 6, 1932. w BAUERMEISTER 1,890,360

ROTARY SHUTTER FOR RNTGEN APPARATUS l Filed D80. l1, 1928 2 Sheets-Sheet W .Bauer Merk/er es; of two laminations,

je of thelaminations thereoffandV VV Patented Dec. 6,-1932 i npnation med December 11,@1e2asgia1 My inventionrelates to improvements in secondary raysgtending to produce unsharp projections orV images On the screen or-sensi-v tized'plat'e. f The object ofthe vimproven ie'ntsj' 15 iste provide -a rotary shutter of the'ciassr'eferredtoby means of which the actionfof thel rays is practically not interfered Wth,;fand

more particularly annular.' shades lare not" produced in thel image, and` the time of .the

A2Q yexposure of the ,sensitized plate is not maf. terially increased. Another object of the'l Y improvements is to provide a rotaryshutter` which is simple in construction and .effective inop'eration, and which can be manufacturedi ,25 atlovvrcost. 4/Vith these and. other objeetslin;

` .vievv one of the features .ofrny improvedf shutterconsists in -disposingfthe transverse;

vIainiliations*forming parts ofthe shutter so that thej number v of the points ofinterse@tion K.39 of Vthe laminations disposed equal distances? away from the axis of the shutter and moving on equal circles is` reduced.

For the purpose of explaining` the invention two ,examples embodying the same have been 35 shown inthe accompanying ldrawings` in which" thel same reference characters haveL i been used in all the views to indicate correr-,-

spending parts. In said Ydrawings,

' Fig; 1 is a perspective vieWshoWing-the 49" shutter and a casing carrying'thesame, 1

'fi Fig. 2'is a sectional plan View taken on the line 2 2 of Fig.1, I l i Fig. V-3 is a detail `perspective Vievv showing a part of the'shutter ata pointl of intersection Fig. 4 is a similar perspective viewshowing amodicatlon, r.. .i

showing the shutter and therelative-position hand ,of the attendant. Byfthus`` having the Y v l v`shutteriby thengerolthe-attendantyvvh Fig. 5 is a-idiagrammatical"'top planview l greph -01 I the. example the axis 'of the shutter: 'rhusthe lemma/tions:

made from a materialipermeable;tollntgenu i Canute engaged'byl flfieiham of the. atfiidait for beingV rot-ated thereby. 1 Forfthe. samever 1 i pufpese Lene bf tl'leefridWallis` of' the formedy with an openingg/l` extending Sub? stent-ally keyhole breadthgofthe bx,;ia`nd I the' shutter S' is likewise: acces''siblel i y the said .peIlling-y2` foipbeingA ,rotatedflbyy the shutter accessible Yfrom different sides [of the box theshutterlv is ,easilyaceessible for being A rotated vin any, position: of the,1002;, In some cases I ,provide similal-r` slots-jor openings-jat other parts of thebox; the operation the apparatus an v u'lseis;A giyen "tof he o new@ 1an-yew sliewiiig) QV i:

shutter isfinf theiorm'offaiercn arymenbr IOL .i

aredispesed withtheirpielespafaileiorsubj! Y pngltleldeleallslets"2/,1andtheshutter S Prof# f iects/Vthrough saidV s1`otsontvvar`d1y. so that' itu f 25 infwhihihe geiser, laminati-ans are placed' Y. vthe screen, necessary another impulse i y' may be given tot-heshutter,V by the hand of the image for a-'long' time,` A f o Asf is known to ,thoseskilled' in the art,

the attendant -cfor permitting inspection Hof.

by rotating theshutter `thefradifal arms are' prevendjfrom producing 's'hales'' on the f image. The armsand therim may be disposedperpendi'cularly tofthe end face vo'ithe shutter, or"y "they :mayg beg slightlyfinfclined Y yrelatively thereto'according to the. divergence "of the Rntgen rays;v When thus Adisposi-ng the arms andthe rim the shadesproduced` 'I thereby ywhen usingth-shuaef wit-hout l tatingthe sameja're equal only to the thickj ness "of the armsg'andwhen 'rottingthefshut- 'Y tenthefreduction ofthefuligh comparatively s'rall.V

:extending substantially to'theiniddle O achl. Y y v v e v v .points Vof intersection of the laminations e,

'crossingzlaminatiom sosjthat thefsaid lam-l B11-.ffInFig. 4"`IV have'V shown a'- lmodification one behind thel other.V in axial, direction',

otherf modificationswn readaypggejs `tlieinselves'tothose skilled inthe art. a` i-In ,the example" shown" in the figures the disiicesjbgtween adjacentiaminations of th' Sets are equal'. If now' the distance be?, tweenjthe rldial arms rand theadjene lmmf ination disposed parallel theretois lequal 'in l`all" the sector s,fthe said sectorsv are subdivided in the same way, and( c orrespediilg. P'OHS y ofy intersection? ofthe 'laminationsl are fdis- '1 Iposjed on the' ysame cir-cle, soy vthat in" the operf ation'of the apparatuscircular .shadesJ are produced inth'e `image byethey rotation fof theshutterf Therefore, in order fto` o bviate this objectionable feature aSfar as p'ossiblel, l dispose` the laminationsnso that the'numbervk nf 4, of. tl1'e` rpoints of intersection `'of' the lamina- *451'v 1 With' this objectin viewI dispose the yfirst 4laminationsinthe sectors d iii'erent".distance"sv tions located onthe saine vcircles is t reduced,y

. awayffroin the radial? arms, so fthatgcorrespondig parts of intersection' Vare, displaced fwith relation' to .each l other in radiali direc? tiori, and al1 thei-points of intersection ,are f distributed on :a .comparatively -1,al'r`f, "e Ynurn-v Y ber ofdi'erent'circles. l

'In the.; construction 'shown' 'inl 5f the vshutteirSn is dividedebyeight lradial arms r1 t@ www eight Sectors. of l @que dimensie; and inthe irfstf sector l1 the "distance between .the first lamination af'za'nd the adj acent armv 1'1 is'` equal toon'e eighth of the'j normal H'disf'V tance between the following-'laminations b1, c1 and d1, while the distance betweenthe first -four sixteenths, letc.`

tween 'the laminations.'

vtance between the'laminationaand the ade r jacent radial arm "r2 is the double of that of f the distance betweenaljandrl, that is two 'alilel`"`In a similar Vwayathe vdistances rbe- -tweengthegrst laminations a?, a? etc. andthe l:adj ac ent arms r?, r4 are successively increased Vto'-threefjeighths,l our feighths,aetc., the dis- ,Y Y Y Atance between a8 andi"8 in the'sectorS being equa-1f'. to: the normal" distance4 between the laminations; o. it

fBy thus shifting one of the sets of 'parallelf laminations the 'successiveA sectors,f the' .points of'intersection` are (gradually 'shiftedl Y outwardly on the lines 7*, e, f, g; so'that they ar'e'floca'ted'inthesectors on diiferent'fcircles.;

'In the 'construction shown in Fig'k the gf of the diferent sectorsfwith thelradial arms' 7" are locatedon the sainev circles.)"HIfn` f Figi@ I have Shownja,mpdifieaaqnmwhieh;

alsostliese pointsfof intersection are disposed with relation to'one another in radial direc-"g first laminationsfai1 andy e?, a? and' eetc. and

successively increased in fthev sectors by onej sixteenthhof thenorinal Vidistance between fthe laminationsij Thusj Ain sec'to'if the d is'taiice' betweenlamination al andiarinv'1 is one'six;`

,teenth of'thelnorrna'l'distance'betweenf',the.- i vlainin'at'ions, Vand thefdistance Ybetweenlamiff o nation'jef andv the adjacent arm r2 istwojsiii; '165' I a teent h s,f in sector` 2 theV distance ,between lamination azandaimr2 is three sixteenthgl, j

andthe distance Y between 'e2 and arm- Sf'is and the distance 'between' 'as and,771Iheingffsixf the ldistancejbetween teen sixt'eenths o f'fthe normal fldistanfce bere Thev sectors) divided l A 'infthe manjrie'rFileE scribed above may be exchanged,v among ene anothervwith'eut changing' the result,because e .the-distribution/off the Circles intersecting the different points. ofinter'section remains the for. examplev when separately:manufacturing the individual'sectors, thesaidsectors-can bef. con'ibined into ashutter in dierentways. i .While .in describing. the'invention referfff,

K 'embodying the same'f'l wish it'tobefundere 'e f f llna'iil 0f thsetefgfnfersectihg- SOQd thetfmy .invention iS not limited-110i the' j the'laminations (151,511, 01),jd1"andrthew'adjacent @in '2, V.equal 1.130- the, 'idfae i betweeilithe said#imiaaansnanche :stoffige the disv'ence has been n iade'l to particular f examples constructions shown r'in 'the drawings', and

that Y various changes may be made -ji'n the',` general-y arrangement of the'apparatus*r and ysaine with anyfsequenceof thesectors. i ,Thus jiz-'G the construction of its parts without departing from the invention.

I claim: f i Y l. A shutter for intercepting secondary Rntgen rays, comprising a member adaptedV to be rotatably mounted inthe path of the Rntgen rays and comprising radial arms dividing the-member into sectors, and sets of crossing laminationsin each of the sectors disposed respectively parallel to the` radial arms bounding the sectors and dis'- posed equal distances apart, the laminations being disposed with their planes substantially in the direction of the-rays and consisting of a material impermeable to Rntgen rays, and the distance between'the rst lamination of each set and its adj acentradial arm ,being j diii'erent in different s-ectors. j

2. A shutter vfor intercepting secondary Rntgen rays, comprising a member adapt# ed to be rotatably mounted in the path of the L Rntgen rays and comprising radial arms gen rays and comprisingradial arms dividi ing the memberinto sectors, andsctsv of crossing laminations in each ofthe sectors disposed respectively parallel tol the radial a arms bounding the sectors and disposed equal jnormal wdistances apart, the laminations bel-j andthe distance between thevflrst lamination 751' of one set and its adjacentradial arm grad-` ually increasing in the successive sectors accordino' to multiples of afraction ofthe normal vdistancebetween. the laminations obf tained `by dividingthe said distance by rtheSO Y' numberof the arms.` I i f In testimonywhereof I aiix my signature,

BAUERMEISTER.

dividing the member into sectors, and two inf tercrossing sets of crossing laminations in each of the sectors disposed respectively parallel to the radial arms bounding the sectors and disposed equal normal distances y apart, the laminations being disposed with their planes substantially in the direction of the rays and consisting of a material impermeable to Rntgen rays, and the distances between the first laminations of corresponding Vsets oflaminations and the adjacent arms being different multiples inthe different sectors of the fraction of thenormal distance between the laminations obtainedbydividing the said normal distance by the number of the sectors'.

3. A shutter for Rntgen rays, comprising a member adapted to be rotatably mounted in the path of the Rntgen v rays and comprising radial arms dividing the member into sectors, and sets of crossing laminations in `each of the sectors disposed respectively parallel to the radialarms bounding the sectors and `disposed equal normal distances apart, the laminations of a material impermeable to Rntgen rays,

the distance between the first lamination of the rst set of parallel laminations and its adjacent arm being equal in the different sec tors to dierent multiples of the fraction obtained by dividing the normal distance between the laminations by the number of the sectors, and the distance between the `first lamination of the other' set and its adjacentv arm being different from the said distance between the rst'lamination of the first set 'i and its adjacent arm by one half of thel said fraction. j Y

4. A shutter Afor intercepting secondary Rntgen rays, comprising a member adapted to be rotatably mounted in the pathof'Rntintercepting secondary i 

